Question

Which of the following unicellular organisms has a macronucleus for trophic function and one or more micronuclei for reproduction?

• A. Euglena
• B. Amoeba
• C. Paramecium
• D. Trypanosoma.

Answer 1

The Correct Option is C

To solve this question, we need to understand the structures and functions of the nuclei in unicellular organisms.

Among the given options, we have:

1. Euglena - A flagellated unicellular organism that possesses a nucleus, but it does not have distinct macronuclei or micronuclei.
2. Amoeba - A shapeless unicellular organism lacking distinct macronuclei or micronuclei; it has a single nucleus for all cellular functions.
3. Paramecium - A ciliated unicellular organism that possesses a macronucleus and one or more micronuclei. The macronucleus controls non-reproductive cell functions, while the micronucleus is involved in reproductive processes.
4. Trypanosoma - A parasitic unicellular organism that has a single nucleus, without the differentiation into macro- and micronuclei.

Based on the above details, Paramecium is the correct answer. It has a macronucleus for controlling metabolic and developmental functions and micronuclei for reproductive functions.

Therefore, the organism with a macronucleus for trophic function and one or more micronuclei for reproduction is:

Correct Answer: Paramecium